STUDENTS READING IMAGES IN KINEMATICS: THE CASE OF REAL-TIME GRAPHS.

Graphs of real-time esperiments are useful tools in science education; their intrinsic features allows innovative didactic approaches. The use of such images is spreading and is likely to become common classroom practice. This paper describes a study in which secondary school students were called upon to read and interpret documents containing images of real-time kinematics graphs specially designed to address common learning problems and to minimize iconic difficulties. Both novice students and those with a little esperience of real-time esperiments were involved. The overall didactic intentions of the presented documents were fulfilled. Some reading difficulties related to specific features were detected and are discussed. Suggestions are made regarding the acquisition of some specific capabilities that are needed to avoid misinterpreting these images and are of transversal value across several contests. Finally, some implications for teacher training and class activities are discussed

An upper limit for the radiative decay width of the J/?? resonance into ?????(958)+??

We present the results of a search performed at ADONE for the reaction e ++e -???J/??????????(958)+??. No evidence was found for such a reaction. The upper limit for the decay is {Mathematical expression} keV (90% CL). © 1977 Società Italiana di Fisica